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The adsorption affinity of N-doped biochar plays a crucial role in peroxydisulfate activation and bisphenol A oxidative degradation.
Zhong, Jie; Ma, Yancheng; Jiang, Shaojun; Dai, Guangling; Liu, Zhenyuan; Shu, Yuehong.
Afiliación
  • Zhong J; School of Environment, South China Normal University, Guangzhou, 510006, China.
  • Ma Y; School of Environment, South China Normal University, Guangzhou, 510006, China.
  • Jiang S; School of Environment, South China Normal University, Guangzhou, 510006, China.
  • Dai G; Jiangxi Province Academy of Environmental Science, Nanchang, China.
  • Liu Z; School of Environment, South China Normal University, Guangzhou, 510006, China.
  • Shu Y; School of Environment, South China Normal University, Guangzhou, 510006, China.
Environ Sci Pollut Res Int ; 29(59): 88630-88643, 2022 Dec.
Article en En | MEDLINE | ID: mdl-35834086
Metal-free biochar to activate persulfate and degrade organic contaminants has attracted great attention in advanced oxidation processes, while the role of biochar adsorption in the activation and oxidative decomposition process still needed to be further clarified. In this study, nitrogen-doped porous biochar derived from a waste litchi branch was prepared as a peroxydisulfate (PDS) activator for bisphenol A (BPA) degradation, in which the regulation behavior of biochar adsorption was evaluated on the basis of phase distribution and PDS activation mechanism. N-doped biochar obtained at 800 °C with urea and sodium bicarbonate added presented a high specific surface area (821 m2/g), abundant nanopores, and a graphitic structure, and showed the best adsorption capacity and catalytic activity toward BPA. At a dosage of 0.15 g/L NBC-800, 95% BPA can be completely degraded within 60 min with an apparent rate constant (kobs) of 0.0483 min-1. The identified active sites and reactive oxygen species as well as electrochemical tests suggested that both free radicals O2•- and •OH and nonradical pathways including 1O2 originated from C = O and surface electron-transfer mechanisms were involved in BPA decomposition. The experiments and activation mechanisms all confirmed that BPA adsorption on the NBC-800 surface was an extremely crucial step for BPA oxidative degradation.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Carbón Orgánico / Estrés Oxidativo Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Carbón Orgánico / Estrés Oxidativo Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania